Hello! Good job for your submission!
- First of all, you .exe file is in debug mode, was it intended? If not, when you select the folder to export in and the name of the .exe file, just untick the "use debug" option.
- Then, when I launch the game, it works for a few seconds and then the game windows disappear and I am unable to launch the .exe again. Did you test your build on other machines?